Considerações sobre o controle tecnológico da execução de revestimentos asfálticos em uma rodovia cearense

Abstract

Understanding how the constituents of asphalt mixtures present themselves, through data collection and statistical treatment, is of paramount importance to promote, increasingly, the improvement of techniques and practices aopted on Brazilian roads coated with asphalt layer. It is necessary to verify whether the dosage parameters of asphalt mixtures are in accordance with the design parameters, with a certain tolerance provided for in the standard. Thus, themain objective of this research was to analyze the composition of the asphalt layer in a real road construction in the state of Cearâ, from statistical considerations on the technological control of execution. To this end, a database was created containing the properties measured during the process of production and application of HMA in the implementation of the highway. The parameters analyzed were binder content, percentage passing the sieve no. 200, airvoids, voids of the mineral aggregate, and the bitumen/voids ratio. The variability of the samples, the assumption that the samples followed the Gaussian distribution, and the conformities for each group of observations for the binder and overlay layers were considered. It was concluded that the normality hypothesis was not observed for most groups of quality parameters analyzed in this work, and the data also presented a significant number of nonconformities. The volume of voids was the parameter with the highest variability, the bitumen/voids ratio was the most prone to non-conformities, and the binder content was the parameter with the highest quality regarding the statistical control performed.